Your users have various visual abilities. Someone who is color-blind might not be able to differentiate between colors or might have difficulty working with colors that are similar to one another. Other users might use zoom to enlarge content. Accommodating various visual abilities is an important part of accessibility.
Contrast
Ensuring adequate contrast makes it easier for everyone to read text content, interpret graphical elements, identify UI components, and notice when those components change state. People with low vision often have difficulty reading text, identifying buttons that don’t contrast with the background, or determining the state of UI components. The problems can be exacerbated if a person has a color deficiency that lowers the perceived contrast even further.
Fortunately, contrast ratios can be checked programmatically. You can use the FastPass tool in Accessibility Insights for Web to perform contrast checking.
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